International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019
p-ISSN: 2395-0072
www.irjet.net
DESIGN AND ANALYSIS OF CONCRETE DIAGRID BUILDING AND ITS COMPARISON WITH CONVENTIONAL BUILDING BY USING STADDPRO Tejaswi Alapati1, Harini Pratti 2, Sadika Majjeti 3 1Asistanat
Professor, Dept. of Civil Engineering, Andhra Loyola Institute Of Engineering and Technology, Vijayawada, Andhra Pradesh 2,3Post-Graduate Students, Dept. of Civil Engineering, Andhra Loyola Institute Of Engineering and Technology, Vijayawada, Andhra Pradesh ---------------------------------------------------------------------***---------------------------------------------------------------------Abstract - Diagrid buildings are emerging as structurally efficient as well as architecturally significant due to the structural efficiency and aesthetic potential provided by the unique geometric configuration of the system. In present work, concrete diagrid structure is analyzed and compared with conventional concrete building which is governed by lateral loads due to wind or earthquake. Later load resistance of the structure is provided by interior structural system or exterior structural system. A regular ten storey RCC building with plan size 16m*16m located in seismic zone-3 is considered for analysis. This software is used for modelling and analysis of structural members .All structural members are designed as per IS 456:2000 and load combinations of seismic forces are considered as per IS:1893(Part 1):2002.Comparision of analysis results in terms of storey drift, node to node displacement, bending moment, shear forces, area of reinforcement, and also the economical aspect is presented. The major portion of lateral load is taken by external diagonal members which in turn release the lateral load in inner columns in diagrid structure. This cause’s economical design of diagrid structure compared to conventional structure. Drift in Diagrid building is approximate half to that obtained in conventional building. In this study, steel reinforcement used in diagrid structureis found to be 33% less compared to conventional building. Key Words: Diagrid, Inclined columns, Axial action, Gravity Loads, Lateral Forces,Drift. 1. INTRODUCTION : Construction of multi-storey building is rapidly increasing throughout the world.i.e., in construction technology, materials, structural systems, analysis and design software facilitated the growth of these buildings. Multi storied development involves various complex factors such as economics, aesthetics look, technology, municipal regulations, and politics. For Multi Storied bulidings its structural design is generally governed by its lateral stiffness.Comparing with conventional orthogonal structures for tall buildings such as framed tubes, diagrid structures carry lateral wind loads much more efficiently by their diagonal member’s axial actionThe main objective of this project is to investigate the behaviour of buildings, i.e., diagrid and conventional frame under the seismic zone3.The major difference between a conventional building and a diagrid building is that, there are no vertical columns present in the perimeter of diagrid building, whereas in conventional building there are vertical column present in the perimeter of the building. Therefore the diagonal members in diagrid structures act both as inclined columns and as bracing elements, and carry gravity loads as well as lateral forces; due to their triangulated configuration, mainly internal axial forces arise in the members, thus minimizing shear cracking effects. The term “diagrid” is a combination of the words “diagonal” and “grid” and refers to a structural system that is single thickness in nature and gains its structural integrity through the use of triangulation.Shapes of diagrid structures are planar, crystalline or take on multiple curvatures . They often use crystalline forms or curvature to increase their stiffness. Perimeter diagrids normally carry the lateral and gravity loads of the building and are used to support the floor edges. Base of the module: The base on which the diagrid is formed usually depends on the height and the optimal angle of the diagrid.. member to the gusset plate and stiffener and then from gusset plate and stiffener to the members below the node in pair of compression and tension.Due to this load transfer path, the shear forces developed at the location of bolt connection is very high under the time of lateral loads. This may be the shear zone or weak zone of this structure during the earthquakes, the designing of the bolt connections is to be done carefully. 2. Modelling:In this study regular square plan,is considered. All the plan area of 256m2 . The structure are modelled in STADD PRO software as shown below. Regular diagrid structure. Plan dimension: 16m×16m.
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